As a 45 year Florida resident, I'd say get the shade. It rarely gets so cold that you need to keep your RV warmed by the sun. Besides, you'll spend most of your time on a lounge chair by the pool and not in your RV. The trees are beautiful and campgrounds that have lots of trees are usually in big demand.
If you like shade in the summer, you'll like it in the winter for the same reasons.
Now if you have an immovable dish on your roof and don't care for the camp's cable TV or your arial antenna, that's a different issue.